Use the EGL API with Android

build.rs

@@ -70,7 +70,7 @@ fn main() {
 
     if target.contains("android") {
         let mut file = File::create(&dest.join("egl_bindings.rs")).unwrap();
-        gl_generator::generate_bindings(gl_generator::StaticGenerator,
+        gl_generator::generate_bindings(gl_generator::StaticStructGenerator,
                                         gl_generator::registry::Ns::Egl,
                                         gl_generator::Fallbacks::All,
                                         khronos_api::EGL_XML, vec![],

src/api/android/ffi.rs

@@ -5,29 +5,6 @@
 
 use libc;
 
-pub mod egl {
-    pub type khronos_utime_nanoseconds_t = super::khronos_utime_nanoseconds_t;
-    pub type khronos_uint64_t = super::khronos_uint64_t;
-    pub type khronos_ssize_t = super::khronos_ssize_t;
-    pub type EGLNativeDisplayType = super::EGLNativeDisplayType;
-    pub type EGLNativePixmapType = super::EGLNativePixmapType;
-    pub type EGLNativeWindowType = super::EGLNativeWindowType;
-    pub type EGLint = super::EGLint;
-    pub type NativeDisplayType = super::EGLNativeDisplayType;
-    pub type NativePixmapType = super::EGLNativePixmapType;
-    pub type NativeWindowType = super::EGLNativeWindowType;
-
-    include!(concat!(env!("OUT_DIR"), "/egl_bindings.rs"));
-}
-
-pub type khronos_utime_nanoseconds_t = khronos_uint64_t;
-pub type khronos_uint64_t = libc::uint64_t;
-pub type khronos_ssize_t = libc::c_long;
-pub type EGLint = libc::int32_t;
-pub type EGLNativeDisplayType = *const libc::c_void;
-pub type EGLNativePixmapType = *const libc::c_void;     // FIXME: egl_native_pixmap_t instead
-pub type EGLNativeWindowType = *const ANativeWindow;
-
 #[link(name = "android")]
 #[link(name = "EGL")]
 #[link(name = "GLESv2")]

src/api/android/mod.rs

@@ -16,14 +16,16 @@ use std::collections::VecDeque;
 use Api;
 use BuilderAttribs;
 use CursorState;
+use GlContext;
 use GlRequest;
 use PixelFormat;
 use native_monitor::NativeMonitorId;
 
+use api::egl;
+use api::egl::Context as EglContext;
+
 pub struct Window {
-    display: ffi::egl::types::EGLDisplay,
+    context: EglContext,
-    context: ffi::egl::types::EGLContext,
-    surface: ffi::egl::types::EGLSurface,
     event_rx: Receiver<android_glue::Event>,
 }
 
@@ -31,7 +33,7 @@ pub struct MonitorID;
 
 mod ffi;
 
-pub fn get_available_monitors() -> VecDeque <MonitorID> {
+pub fn get_available_monitors() -> VecDeque<MonitorID> {
     let mut rb = VecDeque::new();
     rb.push_back(MonitorID);
     rb
@@ -55,41 +57,6 @@ impl MonitorID {
     }
 }
 
-#[cfg(feature = "headless")]
-pub struct HeadlessContext(i32);
-
-#[cfg(feature = "headless")]
-impl HeadlessContext {
-    /// See the docs in the crate root file.
-    pub fn new(_builder: BuilderAttribs) -> Result<HeadlessContext, CreationError> {
-        unimplemented!()
-    }
-
-    /// See the docs in the crate root file.
-    pub unsafe fn make_current(&self) {
-        unimplemented!()
-    }
-
-    /// See the docs in the crate root file.
-    pub fn is_current(&self) -> bool {
-        unimplemented!()
-    }
-
-    /// See the docs in the crate root file.
-    pub fn get_proc_address(&self, _addr: &str) -> *const () {
-        unimplemented!()
-    }
-
-    pub fn get_api(&self) -> ::Api {
-        ::Api::OpenGlEs
-    }
-}
-
-#[cfg(feature = "headless")]
-unsafe impl Send for HeadlessContext {}
-#[cfg(feature = "headless")]
-unsafe impl Sync for HeadlessContext {}
-
 pub struct PollEventsIterator<'a> {
     window: &'a Window,
 }
@@ -138,125 +105,19 @@ impl Window {
     pub fn new(builder: BuilderAttribs) -> Result<Window, CreationError> {
         use std::{mem, ptr};
 
-        if builder.sharing.is_some() {
-            unimplemented!()
-        }
-
         let native_window = unsafe { android_glue::get_native_window() };
         if native_window.is_null() {
             return Err(OsError(format!("Android's native window is null")));
         }
 
-        let display = unsafe {
+        let context = try!(EglContext::new(egl::ffi::egl::Egl, builder, None,
-            let display = ffi::egl::GetDisplay(mem::transmute(ffi::egl::DEFAULT_DISPLAY));
+                                           native_window as *const _));
-            if display.is_null() {
-                return Err(OsError("No EGL display connection available".to_string()));
-            }
-            display
-        };
-
-        android_glue::write_log("eglGetDisplay succeeded");
-
-        let (_major, _minor) = unsafe {
-            let mut major: ffi::egl::types::EGLint = mem::uninitialized();
-            let mut minor: ffi::egl::types::EGLint = mem::uninitialized();
-
-            if ffi::egl::Initialize(display, &mut major, &mut minor) == 0 {
-                return Err(OsError(format!("eglInitialize failed")))
-            }
-
-            (major, minor)
-        };
-
-        android_glue::write_log("eglInitialize succeeded");
-
-        let use_gles2 = match builder.gl_version {
-            GlRequest::Specific(Api::OpenGlEs, (2, _)) => true,
-            GlRequest::Specific(Api::OpenGlEs, _) => false,
-            GlRequest::Specific(_, _) => panic!("Only OpenGL ES is supported"),     // FIXME: return a result
-            GlRequest::GlThenGles { opengles_version: (2, _), .. } => true,
-            _ => false,
-        };
-
-        let mut attribute_list = vec!();
-
-        if use_gles2 {
-            attribute_list.push(ffi::egl::RENDERABLE_TYPE as i32);
-            attribute_list.push(ffi::egl::OPENGL_ES2_BIT as i32);
-        }
-
-        {
-            let (red, green, blue) = match builder.color_bits.unwrap_or(24) {
-                24 => (8, 8, 8),
-                16 => (6, 5, 6),
-                _ => panic!("Bad color_bits"),
-            };
-            attribute_list.push(ffi::egl::RED_SIZE as i32);
-            attribute_list.push(red);
-            attribute_list.push(ffi::egl::GREEN_SIZE as i32);
-            attribute_list.push(green);
-            attribute_list.push(ffi::egl::BLUE_SIZE as i32);
-            attribute_list.push(blue);
-        }
-
-        attribute_list.push(ffi::egl::DEPTH_SIZE as i32);
-        attribute_list.push(builder.depth_bits.unwrap_or(8) as i32);
-
-        attribute_list.push(ffi::egl::NONE as i32);
-
-        let config = unsafe {
-            let mut num_config: ffi::egl::types::EGLint = mem::uninitialized();
-            let mut config: ffi::egl::types::EGLConfig = mem::uninitialized();
-            if ffi::egl::ChooseConfig(display, attribute_list.as_ptr(), &mut config, 1,
-                &mut num_config) == 0
-            {
-                return Err(OsError(format!("eglChooseConfig failed")))
-            }
-
-            if num_config <= 0 {
-                return Err(OsError(format!("eglChooseConfig returned no available config")))
-            }
-
-            config
-        };
-
-        android_glue::write_log("eglChooseConfig succeeded");
-
-        let context = unsafe {
-            let mut context_attributes = vec!();
-            if use_gles2 {
-                context_attributes.push(ffi::egl::CONTEXT_CLIENT_VERSION as i32);
-                context_attributes.push(2);
-            }
-            context_attributes.push(ffi::egl::NONE as i32);
-
-            let context = ffi::egl::CreateContext(display, config, ptr::null(),
-                                                  context_attributes.as_ptr());
-            if context.is_null() {
-                return Err(OsError(format!("eglCreateContext failed")))
-            }
-            context
-        };
-
-        android_glue::write_log("eglCreateContext succeeded");
-
-        let surface = unsafe {
-            let surface = ffi::egl::CreateWindowSurface(display, config, native_window, ptr::null());
-            if surface.is_null() {
-                return Err(OsError(format!("eglCreateWindowSurface failed")))
-            }
-            surface
-        };
-
-        android_glue::write_log("eglCreateWindowSurface succeeded");
 
         let (tx, rx) = channel();
         android_glue::add_sender(tx);
 
         Ok(Window {
-            display: display,
             context: context,
-            surface: surface,
             event_rx: rx,
         })
     }
@@ -317,42 +178,14 @@ impl Window {
         }
     }
 
-    pub fn make_current(&self) {
-        unsafe {
-            ffi::egl::MakeCurrent(self.display, self.surface, self.surface, self.context);
-        }
-    }
-
-    pub fn is_current(&self) -> bool {
-        unsafe { ffi::egl::GetCurrentContext() == self.context }
-    }
-
-    pub fn get_proc_address(&self, addr: &str) -> *const () {
-        let addr = CString::new(addr.as_bytes()).unwrap();
-        let addr = addr.as_ptr();
-        unsafe {
-            ffi::egl::GetProcAddress(addr) as *const ()
-        }
-    }
-
-    pub fn swap_buffers(&self) {
-        unsafe {
-            ffi::egl::SwapBuffers(self.display, self.surface);
-        }
-    }
-
     pub fn platform_display(&self) -> *mut libc::c_void {
-        self.display as *mut libc::c_void
+        unimplemented!();
     }
 
     pub fn platform_window(&self) -> *mut libc::c_void {
         unimplemented!()
     }
 
-    pub fn get_api(&self) -> ::Api {
-        ::Api::OpenGlEs
-    }
-
     pub fn get_pixel_format(&self) -> PixelFormat {
         unimplemented!();
     }
@@ -379,6 +212,32 @@ impl Window {
 unsafe impl Send for Window {}
 unsafe impl Sync for Window {}
 
+impl GlContext for Window {
+    unsafe fn make_current(&self) {
+        self.context.make_current()
+    }
+
+    fn is_current(&self) -> bool {
+        self.context.is_current()
+    }
+
+    fn get_proc_address(&self, addr: &str) -> *const libc::c_void {
+        self.context.get_proc_address(addr)
+    }
+
+    fn swap_buffers(&self) {
+        self.context.swap_buffers()
+    }
+
+    fn get_api(&self) -> Api {
+        self.context.get_api()
+    }
+
+    fn get_pixel_format(&self) -> PixelFormat {
+        self.context.get_pixel_format()
+    }
+}
+
 #[cfg(feature = "window")]
 #[derive(Clone)]
 pub struct WindowProxy;
@@ -388,18 +247,3 @@ impl WindowProxy {
         unimplemented!()
     }
 }
-
-impl Drop for Window {
-    fn drop(&mut self) {
-        use std::ptr;
-
-        unsafe {
-            // we don't call MakeCurrent(0, 0) because we are not sure that the context
-            // is still the current one
-            android_glue::write_log("Destroying gl-init window");
-            ffi::egl::DestroySurface(self.display, self.surface);
-            ffi::egl::DestroyContext(self.display, self.context);
-            ffi::egl::Terminate(self.display);
-        }
-    }
-}

src/api/egl/ffi.rs

@@ -2,8 +2,6 @@ use libc;
 
 #[cfg(target_os = "windows")]
 extern crate winapi;
-#[cfg(target_os = "android")]
-use api::android::ffi;
 
 pub mod egl {
     pub type khronos_utime_nanoseconds_t = super::khronos_utime_nanoseconds_t;
@@ -32,4 +30,4 @@ pub type EGLNativeWindowType = winapi::HWND;
 #[cfg(target_os = "linux")]
 pub type EGLNativeWindowType = *const libc::c_void;
 #[cfg(target_os = "android")]
-pub type EGLNativeWindowType = *const ffi::ANativeWindow;
+pub type EGLNativeWindowType = *const libc::c_void;

src/api/egl/mod.rs

@@ -1,4 +1,4 @@
-#![cfg(target_os = "linux")]
+#![cfg(any(target_os = "linux", target_os = "android"))]
 
 use BuilderAttribs;
 use CreationError;

src/platform/android/mod.rs

@@ -1,3 +1,38 @@
 #![cfg(target_os = "android")]
 
 pub use api::android::*;
+
+#[cfg(feature = "headless")]
+pub struct HeadlessContext(i32);
+
+#[cfg(feature = "headless")]
+impl HeadlessContext {
+    /// See the docs in the crate root file.
+    pub fn new(_builder: BuilderAttribs) -> Result<HeadlessContext, CreationError> {
+        unimplemented!()
+    }
+
+    /// See the docs in the crate root file.
+    pub unsafe fn make_current(&self) {
+        unimplemented!()
+    }
+
+    /// See the docs in the crate root file.
+    pub fn is_current(&self) -> bool {
+        unimplemented!()
+    }
+
+    /// See the docs in the crate root file.
+    pub fn get_proc_address(&self, _addr: &str) -> *const () {
+        unimplemented!()
+    }
+
+    pub fn get_api(&self) -> ::Api {
+        ::Api::OpenGlEs
+    }
+}
+
+#[cfg(feature = "headless")]
+unsafe impl Send for HeadlessContext {}
+#[cfg(feature = "headless")]
+unsafe impl Sync for HeadlessContext {}